求极限LIM1-COSX/XTANX (X趋向0)

问题描述:

求极限LIM1-COSX/XTANX (X趋向0)

当x趋近于0时,1-cosx趋近于x²/2,tanx趋近于x+(x^3)/3.分子分母都等价无穷小替换掉后,等于1/2.